concern.rb

module ActiveSupport::Concern
  def append_features(base)
    if base.instance_variable_defined?("@_dependencies")
      base.instance_variable_get("@_dependencies") << { :module => self, :method => :include }
      return false
    else
      return false if base < self
      @_dependencies.each { |dep| base.send(dep[:method], dep[:module]) }
      super
      base.extend const_get("ClassMethods") if const_defined?("ClassMethods")
      base.class_eval(&@_included_block) if instance_variable_defined?("@_included_block")
    end
  end

  def prepend_features(base)
    if base.instance_variable_defined?("@_dependencies")
      base.instance_variable_get("@_dependencies").unshift({ :module => self, :method => :prepend })
      return false
    else
      return false if base < self
      super
      base.singleton_class.send(:prepend, const_get('ClassMethods'))
      @_dependencies.each { |dep| base.send(dep[:method], dep[:module]) }
      base.class_eval(&@_included_block) if instance_variable_defined?("@_included_block")
    end
  end

  alias_method :prepended, :included
end

No worries. If I find out, I'll tell you. And in the meantime: good luck with Lumen! 🙂

I believe that the slightly different version that is part of easy_auth still works correctly.